The value of static or quasi-static magnetic field present in the sample below the transition is evaluated from the observed change in \(\Lambda \) . Subtracting the minimum value of the relaxation rate to its maximum value at the lowest temperature yields the net increase \(\delta \Lambda \)  = 0.151 \(\mu \) s\(^{-1}\) . The characteristic local magnetic field strength can be estimated from \(\delta \Lambda /\gamma _{\mu } = B_{loc}/\sqrt{2}\) , providing \(B_{loc} \simeq \)  0.18 mT [1]}. The observed local field strength is much larger than the values reported for the other TRSB compounds in their superconducting state (e.g., for Sr\(_2\) RuO\(_4\)  it is 0.005 mT [2]}) but comparable to the value reported for filled skutterudite and frustrated superconductor (0.12 mT for PrOs\(_4\) Sb\(_{12}\)  and 0.116 mT for Re\(_2\) Hf [3]}, [4]}).
